package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        // 2 生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 3 保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 4 发送验证码
        log.debug("发送短信验证码成功，验证码："+ code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1 校验手机号
        if(RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            return Result.fail("手机号格式错误");
        }
        // 2 校验验证码 从redis中获取
        Object cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.toString().equals(code)) {
            return Result.fail("验证码错误");
        }
        // 3 根据手机号查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();
        // 4 若用户不存在保存用户
        if (user == null) {
            user = creatUserWithPhone(loginForm.getPhone());
        }
        // 5 保存用户信息到redis中
        // 5.1 生成token
        String token = UUID.randomUUID().toString(true);
        // 5.2 将user对象转为Hash
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> stringObjectMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        // 5.3 存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,stringObjectMap);
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);

        return Result.ok(token);
    }

    private User creatUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName("user_" + RandomUtil.randomString(10));

        save(user);
        return user;
    }
}
